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import json
import textwrap
import unittest
from django.core.exceptions import SuspiciousOperation
from django.core.serializers.base import DeserializationError, DeserializedObject
from django.core.serializers.json import Deserializer as JsonDeserializer
from django.core.serializers.jsonl import Deserializer as JsonlDeserializer
from django.core.serializers.python import Deserializer
from django.core.serializers.xml_serializer import Deserializer as XMLDeserializer
from django.test import SimpleTestCase
from .models import Author
try:
import yaml # NOQA
HAS_YAML = True
except ImportError:
HAS_YAML = False
class TestDeserializer(SimpleTestCase):
def setUp(self):
self.object_list = [
{"pk": 1, "model": "serializers.author", "fields": {"name": "Jane"}},
{"pk": 2, "model": "serializers.author", "fields": {"name": "Joe"}},
]
self.deserializer = Deserializer(self.object_list)
self.jane = Author(name="Jane", pk=1)
self.joe = Author(name="Joe", pk=2)
def test_deserialized_object_repr(self):
deserial_obj = DeserializedObject(obj=self.jane)
self.assertEqual(
repr(deserial_obj), "<DeserializedObject: serializers.Author(pk=1)>"
)
def test_next_functionality(self):
first_item = next(self.deserializer)
self.assertEqual(first_item.object, self.jane)
second_item = next(self.deserializer)
self.assertEqual(second_item.object, self.joe)
with self.assertRaises(StopIteration):
next(self.deserializer)
def test_invalid_model_identifier(self):
invalid_object_list = [
{"pk": 1, "model": "serializers.author2", "fields": {"name": "Jane"}}
]
self.deserializer = Deserializer(invalid_object_list)
with self.assertRaises(DeserializationError):
next(self.deserializer)
deserializer = Deserializer(object_list=[])
with self.assertRaises(StopIteration):
next(deserializer)
def test_custom_deserializer(self):
class CustomDeserializer(Deserializer):
@staticmethod
def _get_model_from_node(model_identifier):
return Author
deserializer = CustomDeserializer(self.object_list)
result = next(iter(deserializer))
deserialized_object = result.object
self.assertEqual(
self.jane,
deserialized_object,
)
def test_empty_object_list(self):
deserializer = Deserializer(object_list=[])
with self.assertRaises(StopIteration):
next(deserializer)
def test_json_bytes_input(self):
test_string = json.dumps(self.object_list)
stream = test_string.encode("utf-8")
deserializer = JsonDeserializer(stream_or_string=stream)
first_item = next(deserializer)
second_item = next(deserializer)
self.assertEqual(first_item.object, self.jane)
self.assertEqual(second_item.object, self.joe)
def test_jsonl_bytes_input(self):
test_string = """
{"pk": 1, "model": "serializers.author", "fields": {"name": "Jane"}}
{"pk": 2, "model": "serializers.author", "fields": {"name": "Joe"}}
{"pk": 3, "model": "serializers.author", "fields": {"name": "John"}}
{"pk": 4, "model": "serializers.author", "fields": {"name": "Smith"}}"""
stream = test_string.encode("utf-8")
deserializer = JsonlDeserializer(stream_or_string=stream)
first_item = next(deserializer)
second_item = next(deserializer)
self.assertEqual(first_item.object, self.jane)
self.assertEqual(second_item.object, self.joe)
@unittest.skipUnless(HAS_YAML, "No yaml library detected")
def test_yaml_bytes_input(self):
from django.core.serializers.pyyaml import Deserializer as YamlDeserializer
test_string = """- pk: 1
model: serializers.author
fields:
name: Jane
- pk: 2
model: serializers.author
fields:
name: Joe
- pk: 3
model: serializers.author
fields:
name: John
- pk: 4
model: serializers.author
fields:
name: Smith
"""
stream = test_string.encode("utf-8")
deserializer = YamlDeserializer(stream_or_string=stream)
first_item = next(deserializer)
second_item = next(deserializer)
self.assertEqual(first_item.object, self.jane)
self.assertEqual(second_item.object, self.joe)
def test_crafted_xml_rejected(self):
depth = 100
leaf_text_len = 1000
nested_open = "<nested>" * depth
nested_close = "</nested>" * depth
leaf = "x" * leaf_text_len
field_content = f"{nested_open}{leaf}{nested_close}"
crafted_xml = textwrap.dedent(f"""
<django-objects version="1.0">
<object model="contenttypes.contenttype" pk="1">
<field name="app_label">{field_content}</field>
<field name="model">m</field>
</object>
</django-objects>""")
msg = "Unexpected element: 'nested'"
with self.assertRaisesMessage(SuspiciousOperation, msg):
list(XMLDeserializer(crafted_xml))
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